Add WearDisplayService to the system server;
add a SET_DISPLAY_OFFSET permission.

Bug: 36515029
Test: No build failure; SystemServer loads as usual.
Change-Id: I253766553a507e2ada7d631501d8d32d863a823f
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index fe4fafe..5ba7a4f 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1868,6 +1868,11 @@
         android:description="@string/permdesc_useDataInBackground"
         android:protectionLevel="signature" />
 
+    <!-- @hide Allows an application to set display offsets for the screen.
+         This permission is not available to third party applications. -->
+    <permission android:name="android.permission.SET_DISPLAY_OFFSET"
+        android:protectionLevel="signature|privileged|development" />
+
     <!-- ================================== -->
     <!-- Permissions affecting the system wallpaper -->
     <!-- ================================== -->